80 series overheating problem
Submitted: Thursday, Jan 16, 2014 at 13:44
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105836
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Member - Judy and Laurie
Hi all, happy new year, quick question on overheating problem with a 80 series landcruiser 1HZ diesel aftermarket turbo towing a 20' van , the vehicle has new injectors, 3" exaust system . any info would be appreciated .
cheers Judy
Reply By: Members Pa & Ma. - Thursday, Jan 16, 2014 at 14:47
Thursday, Jan 16, 2014 at 14:47
We had the same trouble with the viscous fan in
Kununurra in 2001.
We'd had it checked before we left Vic for our long service leave. It was supposed to be fine.
You wouldn't believe what we were told in
Kununurra.
Wrecked our long service leave.
After we had it floated
home. It was the Viscous Fan & a very common problem with this vehicle, ours is the same. We swapped mechanics
There is a special
test which can be done by a good mechanic with a piece of cardboard.
I'm told that a Turbo will make a diesel engine run hotter too.
Where are you?
Take care, safe travels & may 2014 be good to you. Ma.
AnswerID:
524609
Reply By: cruiser 3 - Thursday, Jan 16, 2014 at 19:59
Thursday, Jan 16, 2014 at 19:59
Hi Judy and Laurie.
You say the overheating only started when towing the van. I would say that it is normal for a vehicle to run hotter when working harder such as towing although most probably only as much as 5 deg higher.
The same applies for changes in ambient temperature. For example traveling around NSW in temperatures of about 25 degs with no towing then take your van to
Darwin where temps are about 35 you could easily see a change in engine temperature from 85 degs to 90 degs or more.
So the question I would ask is what is the engine temperature when you say overheating. IE is it boiling or just increasing in temperature a little? and under what conditions.
AnswerID:
524629
Reply By: Malcolm 02 - Friday, Jan 17, 2014 at 10:04
Friday, Jan 17, 2014 at 10:04
Hi I used to look after these trucks in the mines and they were very reliable machines. None of the
mine vehicles were turbo'd though and have only come in contact with one since leaving the mines and it was having no problems but only towing a camper.
Just a few thoughts, when they fitted the turbo did they upgrade the exhaust system, the bigger the exhaust the more the turbo likes it. But if there is restriction this can hold back the hot exhaust gasses and cause overheating. Did they fit an intercooler? if so I would expect an aftermarket radiator would have been fitted with electric fans for extra cooling, if so are they working? (they would be controlled by an electrical thermostat switch).
An additional suggestion is to change the thermostat in the engine cooling system, they don't cost a lot and they can be tricky to diagnose when they are faulty. If you wish to
test the old one heat it up in water and observe at what temp it starts to open and what temp it fully opens (the temps will be in a workshop manual) this will tell you if it was faulty.
Hope this helps.
Mal
AnswerID:
524656
Reply By: Gone Bush (WA) - Saturday, Jan 18, 2014 at 11:47
Saturday, Jan 18, 2014 at 11:47
I had that issue with my 80 as
well. The temp gauge used to go right to the top towing a camper trailer up prolonged steady inclines.
It seemed to be a combination of things.
I re-oiled the viscous hub, no change.
The biggest factor was that the original radiator was right on the edge of its performance capabilities. I should have upgraded the radiator.
Contributing factors:
The intercooler was in front of the radiator, and
The top and bottom hoses were old and got sucked flat restricting water flow.
AnswerID:
524709
Reply By: howesy - Saturday, Jan 18, 2014 at 13:10
Saturday, Jan 18, 2014 at 13:10
Just a couple things to consider,,, most aftermarket turbo fitters simply screw the fuel up which is fine for normal driving but without actually having the auto advance tweaked and timing to suit turbo which is done on a bench it is a crude compromise and under extreme load over fuels slightly however if its not actually boiling and when you coast downhill the temp comes down quickly you will probably find the super reliable factory guage although it goes up a fair whack may only be registering 5 degrees,,, you need a reliable aftermarket guage and if your pump ever needs doing and you remove it yourself make sure they know its running a turbo and they will set it up accordingly. I too have 1HZ with aftermarket turbo (HZJ75) and I was concerned about guage movements until I got an aftermarket guage. My factory guage shows less than 1/4 on coasting downhills, just under 1/3 for normal flat driving and a tad under half for heavy load. My normal road weight in its std trim is around 2.7T
AnswerID:
524714
Follow Up By: awill4x4 - Saturday, Jan 18, 2014 at 14:03
Saturday, Jan 18, 2014 at 14:03
Howesy is about the only one on this thread that has picked up on a possible over fueling issue.
Over fueling gives a much hotter burn in the cylinder and this is transferred to the cooling system through the head.
With all you have done it's now time to look at your fueling and the best way is to fit an EGT (Exhaust Gas Temperature) gauge.
Have the thermocouple fitted just past the turbo exhaust flange and drive the L/Cruiser so it only reaches a maximum of 500-550C.
If in top gear and the EGT's start to climb too high then change down a gear and this can knock off 50C+ of EGT's simply by changing down a gear.
If you are noticing consistently high EGT's then the car should be tuned by a reputable diesel mechanic preferably on a dyno so he can replicate how the engine is coping under load.
Regards Andrew.
FollowupID:
806516
Follow Up By: Life Member TourBoy, Bundaberg - Sunday, Jan 19, 2014 at 10:43
Sunday, Jan 19, 2014 at 10:43
Yeah I brought the fuel up in reply 8 :)
FollowupID:
806543
Follow Up By: awill4x4 - Sunday, Jan 19, 2014 at 10:54
Sunday, Jan 19, 2014 at 10:54
Sorry TourBoy I missed your comment about over fueling at the end of your post.
Regards Andrew.
FollowupID:
806544
Reply By: Member - DOZER - Sunday, Jan 19, 2014 at 21:54
Sunday, Jan 19, 2014 at 21:54
You can try this trick....a mate has thesame issue, and to prove it was the fan, i gave him an old electric fan from a commodore, and he mounted it between the radiator and grill.
It proved his viscous fan wasnt working properly, so he went and got it serviced, but wouldnt give me back my fan because the air conditioning was working so much better aswell....might make all the difference to your issue.
AnswerID:
524757